blwnsmke

I was sitting at a redlight and spooled it up and my trans temp gauge started climbing really fast.. I pulled over and kill the truck and the gauge was on 250. I pulled the dipstick and the fluid was not even hot.. I have the diesel manor line with the temp sender in it.. Maybe my gauge is messing up? Im having trouble with my egt probe jumping all around reading funny to

soulezoo

That is a normal thing... where you have the sensor is right where fluid is the hottest after it gets done shearing in the TC. Run at speed and lock the TC and watch the temp drop rapidly before your eyes.

Mr Bee

Interesting point.... I just had my trans. completely gone through by Goerends. Could not be happier!!! But, I asked him about the sensor position as I have one in the line that goes to the cooler just as Blwnsmke does. Dave commented that he would rather know what the pan temp is. I questioned him about this and he stated that once the trans is rebuilt the correct way so the TC does not slip so much, he is more interested in the oil in pan temp, that tells him what the temp is going into the TC and VB...He said it would be great if both temps were available, but if only one trans pan temp. especially if you have the Mag Hytech DD pan.

Foxborough

I had the same problem last year. It is the power module that is bad. My gauge would show 250 then 150 within seconds. I was driving from Rockford to Dubuque, IA and had this happen to me. I kept stopping and checking the dipstick heat. I had to put a sticky over the gauge so I would not look at it. The problem is the probe, gauge and power module are callibrated togeather. Mine was under warranty, Dieselmanor guy took care of me perfectly.

blwnsmke

Well I have both the egt and the trans temp acting goofy like that!! The egt been doing it for a while now and now all a suddent the other day the trans temp started. But only done is 2 times so far.. EGT does it about everyday at least!!

blwnsmke

Hmm.. Wonder if I should replace mine into the pan??? Anyone else got any idea?

Pooter

Im not a transmission guy, and I value Dave's opinion, but I would rather see the hottest temps my tranny is going to see, just to be further on the safe side.
Same thing with EGTs...

Its not so much thats its a false reading, just know that it is going to be higher than youll see at the pan...

I have the diesel manor line, and my trans sits at 180-190 in traffic sitting at a stop light(maybe 200* with 85*-95* outside temps)
Your gauge could be acting up? Double check all your electrical connections/grounds, if not maybe try swapping out the guage.

ptgarcia

I've asked several tranny guys where to put the sensor and every one has told me in the pan.

no_6_oh_no

..and every one I talk to that knows anything about towing with an auto says hot line.

There is some major disconnects about things in the original statement that lead me to believe there is a lot of context that is missing. For one, a built trans with a tighter converter will always see higher temps out of the TC than a stock TC given the same circumstances. This is not opinion or conjecture, it is well documented observed behaviour.

That just doesn't jive with the conversations I have personally had with Dave or any other big player in this arena.

RonP

I have the gauge in the hotline and it acts exactly as stated above. I have seen 250 a couple times running around town in 90+ degree weather. If it is already at 190 or so and I run from one light to another, the tighter converter builds a good bit of heat and since it never locks up between lights, it eventaully gets to the 250 mark. I don't worry about it. If I pull it down to 2nd and let the converter lock, it starts cooling instantly. nature of the beast.

SOhappy

So.. let me ask you guys with the sensor in the hot line this:

How do you really know when to pull over and let it cool down?

Of course you are seeing real time data, but it appears that's not always a good thing.

With it in the pan, or the test port ( ) you can concentrate more on long-term trends, i.e. "is the ATF really getting cooked, or is it a temporary spike?" It takes time at a certain temperature to cook the ATF, a something a spike here and there over 250 won't do. I know when to pull over and let it cool down when it hits about 200-225 (depending on what's up ahead). Something that's only happened to me once so far, towing heavy up a long, steep dirt road to a campsite- and my 62,000 mile ATF* still looks and smells pretty good.

*changed fluid in pan at 30k, time to do it again.

letsee...where did I put my flame suit...

soulezoo

We can discuss merits of hotline vs pan... but DON'T EVER USE THE TEST PORT! I found that one out the hard way.

For full disclosure, I have a Goerends tranny with the Mag-hytec DD pan... sensor is in the hotline.

blwnsmke

Thats exactly how hot mine runs around town and our outside temps are the same

rjm022

i have two tranny temp gauges-one in the hot line and one in the pan!

Hvytrkmech

Not a tranny guy here, but I thought a tighter converter lowered tranny fluid temp?